Uniform dyeing of viscose



Patented Apr. 12, 1932 UNITED STATES PATENT OFFICE ANILINE WORKS, INC.,.OF NEW YORK,

N. Y., A CORPORATION OF DELAWARE UNIFORM DYEING OF VISGOSE The presentinvention relates to the uniform dyeing of viscose silk of differentorigin.

It is known that it is very difficult to obtain even shades in thedyeing of viscose of different origin, for example of knitted artificial silk.

According to the present invention these difliculties are overcome bydyeing viscose with azo dyestuffs of the general formula:

wherein R stands for the residue of any coupling component and R standsfor a benzene nucleus which may be substituted by a sulphonic or'carboxylic acid group, to which the azo group is attached in meta orpara position to m, and m' stands for an azo or azoxy group.

The dyestuffs used for the purpose of my invention are obtainable by thecombination of tetrazo compounds of mand p-azoxyaniline and substitutionproducts thereof with any desired coupling components, or by couplin gthe diazo compounds of 3- and ii-nitroaniline or substitution productsthereof with any desired component and subsequent reduction of theresulting monoazo dyestuffs with alkaline reducing agents, for example,grape sugar in alkaline solution, to the disazo-azoxy dyestuffs ortrisazo dyestuffs.

The dyeing is carried out in the usual man nor as outlined in theexamples, by dissolving the dyestuffs in hot water and adding to thedye-bath Glaubers salt and monopol soap (a water soluble salt ofsulfonated castor oil) if desired with the addition of a wetting agent,f. i. an. alkyl-naphthalene-sulfonio acid, such asisobutyl-naphthalene-disulfonic acid. The viscose is introduced into thebath at about 30 G., then the bath is slowly heated to about 80 (3., atwhich temperature the viscose is dyed for about 4 to 1 hour. Then theviscose is washed and dried.

The dyeings thus obtained are distinguished by their uniformity.

No Drawing. Application filed February 9, 1929, Serial No. 338,891, andin Germany February 17, 19 28.

The invention is illustrated by the following examples, without beinglimited thereto:

Emample 1.-10 kgs. of knitted viscose are dyed in 300 liters of water.are added 200 gms. of the dyestuff, obtained by coupling the diazocompound of 4-nitraniline-2-sulfonic acid with 2-naphthylaminesulfonicacid and linking two molecules of the resulting monoazo dyestuff bytreatment with alkaline reducing agents; 200 gms. of monopol soap (awater soluble salt of sulfonated castor oil and 2 kgs. of Glaubers saltare added. yeing is effected for one hour at about 80 C. and is followedby rinsing" and drying. The fabric is dyed uniformly a reddish blueshade.

Example 2.The dye-bath is prepared with 200 gms. of the dyestuif,obtained by coupling the diazo compound of 3-nitraniline with2-naphthol-S-monosulfonic acid and linking two molecules of theresulting monoazo dyestuff by treatment with alkaline reducing agents,in 300 liters of water. 10 kgs. of knitted viscose are introduced intothe dye-bath, which is then heated, 200 gms. of monopole soap and 2 kgs.of Glaubers salt are added, and the dyeing is completed within an hourat about 80 C. The fabric is dyed a uniform orange.

Example '3.10kgs. of knitted viscose are dyed in 300 liters of water. Tothe dye-bath are added 200 gms. of the dyestuif, obtained by couplingthe diazo compound of 4-nitraniline-Q-sulfonic acid with phenol,methylating the hydroxy group of the monoazo dyestuff and linking twomolecules of the resulting monoazo dyestufi' by treatment with grapesugar in alkaline solution to the corresponding disazo-azoxy dyestufl,having probable the formula:

SOaH SOaH 200 gms. of monopol soap and 2 kgs. of Glaubers' salt areadded. Dyeing-is efl'ected for one hour at about 80 C. and is followedby rinsing and drying. The fabric is dyed uniformly a gold orange shade.

To the dye-bath 4 i n1tranlline+2.5 gminonaphthol 4 nitranil ne+2.8aininonaphthol Disazoazoxy compound or trisazo dyestuff from the monoazodyestui! Dyes uniformly 4 nitraniline --2 sulfonic acid+1 Reddish bluenaphthyl-- amine 4 sulfonic acid.

4 nitmniline 2 'sulfonic acid +2 Reddish blue na hthyl amine 6-sulfonicacld.

4 n traniline 2 sulfonic acid 1 Bordeaux naphtholi-sulfonic acid.

4 mtraniline 2 suitonic acid 2 Wi d na hthoi-7-sulfonic acid.

4 n tr'aniline 2 sulfonic acid 2 Blue methyiamino naphthaline 7 sultonicacid.;-

4 nitraniline+2 naphthol 3:7 R ddish blue disulfonic acid.

4 nitraniline+2 naphthol 6.8 Violet disuifonic acid.

4 nitraniline 2 naphthol 8 mono- Wine red sulfonic acid.

3 nitraniline+1 naphthylamine Orange 4.7-disulfonic acid.

8 nitraniline 1 naphthol 3.6 di- 'sulfonic acid.

4 nitraniline 2 aulfonic acid +pyrazolone fromdehydrothiotoluidinemonosulfonic acid.

4 nitmniline 2 carboxylic acid pyrazclone fromdehydrothiotoiuidinemonosulfonic acid.

4 nitraniline 1.8 dihydroxy naphthaline 4 sultonic acid.

Beddish orange.

Orange Orange Violet Bordeaux Blue 7 disulfonic ac 4 nitrani1ine 2sultonic acid+ 2.5 aminonaphthoi- 7 sulfonic acid (acid cou ling). 1

3.6 disulfonic acid -(acid coupling).

I claim: 1.-The

which comprises dyeing the viscose in the customarymanner with adyestufi of the general formula:

wherein R stands for the residue of any coupling component, B." standsfor a benzene nucleus which may be substituted by a sulfonic orcarboxyhcacid group and which benzene nucleus is in one of the positionsconsisting of the para and meta positions to m, and :1: stands for oneof the groupings consisting of the azoand azoxy-groups.

2. The process for the uniform dyeing of viscose of various origin,which comprises dyeing the viscose in the customary manner process forthe uniform dyeing of viscose of various ongi' '11,

attached to the azo group which comprises 4. As new products ofmanufacture knitted viscose dyed with a dyestufi' as claimed in claim 1.

5. As new products of manufacture knitted viscose dyed with a dyestufias claimed in claim 2.

6. As new products of manufacture knitted viscose dyed with thedyestufl' claimed in claim 3.

In testimony my hand,

z 'KARL BORMANN. [n 8.]

whereof I have hereunto set sou: I 801R o cn,o-O ONQNON=NOO on.

